如何在Swift中设置按钮文本

Question

如何删除后退按钮文本.

self.navigationItem.backBarButtonItem?.title = "Back"
self.backItem?.title = ""
self.navigationController?.navigationBar.backItem?.title = ""
self.navigationItem.backBarButtonItem?.title = ""
self.navigationController?.navigationItem.backBarButtonItem?.title="Back"
self.navigationController?.navigationBar.backItem?.title = ""
self.navigationController?.navigationItem.backBarButtonItem?.title

这些都没有奏效:

self.navigationItem.backBarButtonItem?.title = "Back"
self.backItem?.title = ""
self.navigationController?.navigationBar.backItem?.title = ""
self.navigationItem.backBarButtonItem?.title = ""
self.navigationController?.navigationItem.backBarButtonItem?.title="Back"
self.navigationController?.navigationBar.backItem?.title = ""
self.navigationController?.navigationItem.backBarButtonItem?.title

Answer 1

后退按钮属于上一个视图控制器,而不是当前在屏幕上显示的控制器.
要修改后退按钮,您应该在推送之前更新它,在启动segue的视图控制器上:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let backItem = UIBarButtonItem()
    backItem.title = "Something Else"
    navigationItem.backBarButtonItem = backItem // This will show in the next view controller being pushed
}

斯威夫特3:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let backItem = UIBarButtonItem()
    backItem.title = "Back"
    navigationItem.backBarButtonItem = backItem // This will show in the next view controller being pushed
}

Answer 2

您可以从界面构建器执行以下操作:

单击上一个视图控制器的导航项

从属性检查器中将后退按钮文本设置为您想要的任何内容.而已!!

Answer 3

后退按钮文本取自父视图控制器的导航项标题.因此,无论您在之前的视图控制器的导航项目标题上设置什么,都将显示在当前视图控制器的后退按钮文本上.您可以在父视图控制器的viewWillAppear方法中将""作为导航项标题.

self.navigationItem.title = ""

另一种方式是放

self.navigationController?.navigationBar.topItem?.title = ""

在当前视图控制器的viewWillAppear方法中.如果导航堆栈太嵌套,这将导致一些其他问题.

Answer 4

您可以将这3行代码放入您的代码中override func viewDidLoad() {}.

let backButton = UIBarButtonItem()

backButton.title = "name"

self.navigationController?.navigationBar.topItem?.backBarButtonItem = backButton

Answer 5

如果您正在为视图控制器使用xib文件,请在视图控制器类中执行此操作.

class AboutUsViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    edgesForExtendedLayout = []
    setUpNavBar()
}

func setUpNavBar(){
    //For title in navigation bar
    self.navigationController?.view.backgroundColor = UIColor.white
    self.navigationController?.view.tintColor = UIColor.orange
    self.navigationItem.title = "About Us"

    //For back button in navigation bar
    let backButton = UIBarButtonItem()
    backButton.title = "Back"
    self.navigationController?.navigationBar.topItem?.backBarButtonItem = backButton
}

}

结果将是:

Answer 6

我不知道你在哪里使用了你提出问题的方法,但是如果我在我的ViewController课堂上(我想改变后退按钮),我可以得到所需的结果,在viewDidLoad()功能上,如下所示:

self.navigationController?.navigationBar.backItem?.title = "Anything Else"

结果将是:

之前

后

Answer 7

后退按钮属于上一个视图控制器,而不是当前在屏幕上显示的控制器.要修改后退按钮,您应该在推送之前更新它,添加viewdidload:

self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: self, action: nil)

Answer 8

您只需修改故事板中的NavigationItem即可

在后退按钮中添加一个空格,然后按Enter键.

注意:在之前的VC中执行此操作.

Answer 9

这应该工作:

override func viewDidLoad() {
    super.viewDidLoad()

    var button = UIBarButtonItem(title: "YourTitle", style: UIBarButtonItemStyle.Bordered, target: self, action: "goBack")
    self.navigationItem.backBarButtonItem = button

}

func goBack()
{
    self.navigationController?.popViewControllerAnimated(true)
}

虽然不建议这样做,因为它实际上替换了backButton并且还删除了后退箭头和滑动手势.

Answer 10

Swift 4 - 在推送任何视图控制器之前配置后退按钮

// if you want to remove the text
navigationItem.backBarButtonItem = UIBarButtonItem()

// if you want to modify the text to "back"
navigationItem.backBarButtonItem = UIBarButtonItem(title: "back", style: .plain, target: nil, action: nil)

Answer 11

斯威夫特4.2

如果要更改导航栏的后退按钮项文本，请将其放在viewDidLoad控制器中显示后退按钮的位置之前，而不是放在显示后退按钮的视图控制器上。

 let backButton = UIBarButtonItem()
 backButton.title = "New Back Button Text"
 self.navigationController?.navigationBar.topItem?.backBarButtonItem = backButton

如果要更改当前导航栏标题文本，请使用下面的代码（请注意，这将成为推送到导航控制器上的NEXT视图的默认背景文本，但是该默认背景文本可以被上面的代码覆盖）

 self.title = "Navigation Bar Title"

Answer 12

有两种方法。

1.在之前的ViewController.viewDidLoad()

let backBarBtnItem = UIBarButtonItem()
backBarBtnItem.title = "back"
navigationItem.backBarButtonItem = backBarBtnItem

2.在currentViewController.viewDidAppear()

let backBarBtnItem = UIBarButtonItem()
backBarBtnItem.title = "back"      
navigationController?.navigationBar.backItem?.backBarButtonItem = backBarBtnItem

原因：backButton来自navigationBar.backItem.backBarButtonItem，所以第一种方式是显而易见的。在currentViewController.viewDidLoad()中，我们无法获得的引用backItem，因为在viewDidAppear()中，navigationBar推送navigationView了它。所以stack我们可以对backItemcurrentViewController中的进行更改。 viewDidAppear()

更多详细信息，您可以查看文档：UINavigationBar

Answer 13

返回按钮文本和颜色文本：

navigationController?.navigationBar.tintColor = .red
navigationController?.navigationBar.topItem?.backButtonTitle = "Hi"